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EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS (Details 4) (FY 2013 Acquisition [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
FY 2013 Acquisition [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets $ 739us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
$ 320us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Interest cost 610us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
236us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Net pension income $ 129us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
$ 84us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember